June 8, 2026
There’s a little-known tool in mortgage qualification that can dramatically change how much you’re approved for — and most borrowers have never heard of it. It’s called income grossing up, and if you’re receiving non-taxable income, or if you’re self-employed, it could unlock significantly more purchasing power than you think.
What Is Income Grossing Up?
When lenders calculate your mortgage eligibility, they look at your gross income to determine your debt service ratios (GDS and TDS). But some income sources — like disability payments or workers’ compensation — are non-taxable. To elevate non-taxable income sources to a level qualification playing field, lenders allow you to gross them up: apply a percentage increase to reflect what that income would be worth in before-tax terms.
The result? A higher qualifying income figure — without actually earning more money. That difference can translate into tens of thousands of dollars in additional mortgage eligibility.
Non-Taxable Income: The Most Common Gross-Up
Most Canadian lenders recognize the following non-taxable income types as eligible for grossing up:
- Workers’ Compensation (WSIB) payments
- Long-term disability income — from a private insurer or government program, confirmed non-taxable and guaranteed for the applicant’s lifetime
- Guaranteed Income Supplement (GIS)
- Income exempt under the Indian Act
- Non-taxable child support and spousal support — where confirmed non-taxable on the tax return
The gross-up factor most lenders apply:
| Non-Taxable Income Amount | Gross-Up Factor | Example |
|---|---|---|
| Under $30,000/year | 25% | $25,000 → $31,250 |
| $30,000/year or more | 35% | $40,000 → $54,000 |
Documentation is required to confirm the income is non-taxable — a T4A, T5007 (for WSIB), a letter from CRA, or a letter from the organization providing the income.
Self-Employed Income: The 15% Gross-Up
Self-employed borrowers often show a lower taxable income on their NOA due to legitimate business write-offs — which can make mortgage qualification challenging. To address this, most lenders allow self-employed income to be grossed up by up to 15% for sole proprietors and partnerships.
The eligible T1 General income lines are:
- Line 13500 — Business Income
- Line 13700 — Professional Income
- Line 13900 — Commission Income
- Line 14100 — Farming Income
- Line 14300 — Fishing Income
Some lenders will consider a gross-up above 15% — up to 20% — with a written rationale documenting non-cash expenses such as motor vehicle costs, business use of home, or capital cost allowance. Anything above 20% is typically treated as an exception and requires a more detailed review.
This is also worth keeping in mind when you’re thinking about how the mortgage stress test applies to your file — because the qualifying rate is applied to whatever income the lender accepts, and grossing up can make a meaningful difference to what you pass at.
Important: If you’re incorporated and pay yourself a salary or dividends from a corporation, the standard 15% gross-up may not apply. Lenders typically use your two-year average of employment and/or dividend income as declared on your T1 Generals instead. The rules vary — which is exactly why having an experienced broker is crucial, as multiple lenders will be called upon with differing qualification guidelines.
What Does NOT Qualify for Gross-Up
- CPP / QPP / OAS — already reported as gross amounts on your return; not eligible for an additional gross-up.
- Canada Child Benefit (CCB) — can be used as qualifying income (generally up to 50% of total income, child must be under 15), but no gross-up is applied.
- Foster Care Income — most lenders do not permit a gross-up on foster care income.
- Social Assistance — generally not eligible. Limited exceptions exist for certain permanent provincial disability support programs.
Real-World Impact: What the Numbers Look Like
Here’s a quick example. A borrower receives $36,000 per year in non-taxable long-term disability income. Under the 35% gross-up, their qualifying income increases from $36,000 to $48,600.
At a qualifying rate of approximately 5.25% and assuming minimal debts, that $12,600 increase in qualifying income can translate to roughly $50,000–$65,000 in additional mortgage eligibility. That’s the difference between qualifying and not qualifying — or between the property you want and a significant compromise.
Key Gross-Up Rules at a Glance
| Income Type | Gross-Up Eligible? | Typical Factor |
|---|---|---|
| Non-taxable disability / WSIB | ✅ Yes | 25% (under $30K) / 35% ($30K+) |
| Guaranteed Income Supplement | ✅ Yes | 25% (under $30K) / 35% ($30K+) |
| Indian Act income exemption | ✅ Yes | 25% (under $30K) / 35% ($30K+) |
| Non-taxable support payments | ✅ Yes | 25% (under $30K) / 35% ($30K+) |
| Self-employed (sole prop/partnership) | ✅ Yes | Up to 15% (up to 20% with rationale) |
| Incorporated — salary/dividends | ⚠️ Varies by lender | Discuss with your broker |
| CPP / QPP / OAS | ❌ No | N/A |
| Canada Child Benefit (CCB) | ❌ No | N/A — used at face value |
| Foster Care Income | ❌ No | N/A |
Bottom Line
Income grossing up is one of those areas where proper file structuring genuinely changes outcomes. If you’re receiving non-taxable income or you run your own business, there may be more qualifying income available to you than what appears on a tax return. The key is knowing how to document it and which lender will treat it most favourably for your specific situation.
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